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<div  id='write'  class = 'is-node'><h1><a name="0-java%E5%B7%A5%E7%A8%8B" class="md-header-anchor"></a><span>0 Java工程</span></h1><h2><a name="java%E5%91%BD%E4%BB%A4" class="md-header-anchor"></a><span>Java命令</span></h2><h3><a name="javac" class="md-header-anchor"></a><span>javac</span></h3><p><span>除非是只有一个Java源文件，否则还是使用IDEA来编译吧。</span></p><p><span>-d：指定编译产生文件的输出路径</span><br/><span>-cp：指定java源文件或类的搜索路径</span><br/><span>-source-path：指定Java源文件的搜索路径，如果有这个选项，则-cp只会搜索类，不搜索源文件  </span></p><h3><a name="java" class="md-header-anchor"></a><span>java</span></h3><p><span>-cp/-classpath：目录和zip/jar文件的类搜索路径，多个路径之间用 ; 隔开</span></p><p><span>java dir/class 或者 java dir.class 是在dir目录的上级目录中执行package为dir的class文件，如下图：  </span></p><p><img src='images/0_Java工程_FA4CC57E3A724195FEE96A188A2A7988.jpg' alt='0_Java工程_FA4CC57E3A724195FEE96A188A2A7988' referrerPolicy='no-referrer' /></p><p><span>要执行包名为默认的class文件，需要将cmd进入class文件所造的目录，使用 java class。</span><br/><span>或者是直接 java -cp path class。</span></p><h2><a name="%E8%AF%BB%E5%8F%96%E9%85%8D%E7%BD%AE%E6%96%87%E4%BB%B6" class="md-header-anchor"></a><span>读取配置文件</span></h2><p><span>因为IDEA执行Java时，cmd的当前路径是Java工程的顶级目录，所以调试时将配置文件放在Java工程的顶级目录，使用相对路径读取。</span><br/><span>编译完成后，将jar包或class文件和配置文件放置在同一个目录下，就能正常读取配置文件了。</span></p><p><img src='images/0_Java工程_4AB008A0BB25B86D065FBD9355D34297.jpg' alt='0_Java工程_4AB008A0BB25B86D065FBD9355D34297' referrerPolicy='no-referrer' /></p><p><span>打包进jar包的配置文件，使用</span><code>this.getClass().getResourceAsStream(&quot;/conf&quot;)</code><span>读取，配置文件和Java源码放置在一起，IDEA中就是src目录下面。</span><br/><span>this是当前对象，配置文件的路径如果用【/】开头，就是绝对路径，从src目录开始算，相对路径是从当前对象的类所在的目录开始算。  </span></p><p><span>Java中每个类都有一个对应的Class对象（</span><strong><span>基本数据类型、数组也有</span></strong><span>），这个对象中保存了对应类的信息，Class也是继承自Object的。Object的getClass()方法可以获得当前对象的类的对应的Class对象。</span></p><h2><a name="idea%E6%89%93%E5%8C%85jar" class="md-header-anchor"></a><span>IDEA打包jar</span></h2><p><img src='images/0_Java工程_8B1193E5D7067C360013474DE33F6035.jpg' alt='0_Java工程_8B1193E5D7067C360013474DE33F6035' referrerPolicy='no-referrer' /></p><p><img src='images/0_Java工程_B7CB23F33109FE49FCEF7197F0618002.jpg' alt='0_Java工程_B7CB23F33109FE49FCEF7197F0618002' referrerPolicy='no-referrer' /></p><p><img src='images/0_Java工程_92975EEDA0B798EFF0E20493D1B6ADF0.jpg' alt='0_Java工程_92975EEDA0B798EFF0E20493D1B6ADF0' referrerPolicy='no-referrer' /></p><p><span>如果这个jar包不需要被执行，只是需要被其他工程导入，那这个Main Class就不用填写了。</span></p><p><img src='images/0_Java工程_3ECC3F33E42A5E2EEE33308206D0D7E9.jpg' alt='0_Java工程_3ECC3F33E42A5E2EEE33308206D0D7E9' referrerPolicy='no-referrer' /></p><p><img src='images/0_Java工程_F253E9E3547733ABB01FB3C0EC6F54B1.jpg' alt='0_Java工程_F253E9E3547733ABB01FB3C0EC6F54B1' referrerPolicy='no-referrer' /></p></div>
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